[lit] Avoid StringIO.  - We barely used it, and it is very hard to use in a 2.5-3 compatible    way because of changing expectations for its input types.
[lit] Avoid StringIO.
 - We barely used it, and it is very hard to use in a 2.5-3 compatible
   way because of changing expectations for its input types.

git-svn-id: a4a6f32337ebd29ad4763b423022f00f68d1c7b7@188359 91177308-0d34-0410-b5e6-96231b3b80d8

lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx